#video {
    width: 700px;
    height: 450px;
    margin: 0 auto;
    border: 1px solid silver;
}

#mp4par {
    position: relative;
    width: 700px;
    height: 450px;
    background-color: black;
    float: left;
    overflow: hidden;
}
#mp4 {
    position: relative;
    width: 700px;
    height: 450px;
}
#controls {
    position: absolute;
    width: 700px;
    height: 75px;
    bottom: -75px;
    z-index: 10;
    background-color: rgba(255, 255, 255, 0.31);
    text-align: center;
    transition: all 0.3s ease-in;
}
#mp4par:hover #controls{
    bottom: 0;
}
#btntime {
    width: 700px;
    outline: none;
}
#btnsound {
    position: relative;
    top: 5px;
}
button {
    position: relative;
    width: 40px;
    height: 20px;
    /* border-radius: 50%; */
    outline: none;
    border-style: none;
    /* background: radial-gradient(#ffae9f, #ff2f39); */
    margin: 18px;
    color: #474747;
}
.iconfont {
    font-size: 24px;
    color: #474747;
}